HARD SUDOKU FOR PRO- 240 HARD puzzles for SUDOKU - Large characters- 4 puzzles per page- 60 pages of sudoku exercises plus 60 pages of solutions (total: 120 pages)SUDOKU puzzles are known to reduce anxiety, Great for memory training, great fun and easy to learnEven if you have absolutely no math skills.HOW TO DO?Simply enter the numbers 1 to 9 once in each row, column and box to solve each sudoku
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